1756-IR6I/A

1756-IR6I/A

1756-IR6I/A

1．输入继电器(X)  

 输入继电器是PLC接收外部输入的开关量信号的窗口。PLC通过光耦合器，将外部信号的状态读入并存储在输入映像寄存器中。输入端可以外接常开触点或常闭触点，也可以接多个触点组成的串并联电路或电子传感器(如接近开关)。在梯形图中，可以多次使用输入继电器的常开触点和常闭触点。  

 图3–6是一个PLC控制系统的示意图，X0端子外接的输入电路接通时，它对应的输入映像寄存器为1状态，断开时为0状态。输入继电器的状态惟一地取决于外部输入信号的状态，不可能受用户程序的控制，因此在梯形图中绝对不能出现输入继电器的线圈。

因为PLC只是在每一扫描周期开始时读取输入信号，输入信号为ON或OFF的持续时间应大于PLC的扫描周期。如果不满足这一条件，可能会丢失输入信号。

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